JPS618883A - Slide contact unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sliding contact device, and particularly to the materials of the brush and commitake or slip ring constituting the sliding contact device.

(Prior art and problems) The conventional sliding contact device contains 20 to 70% by weight of Pd and 3% Ag.
A brush made of 0 to 80% by weight alloy material, and Ag
-CdO, in combination with a commutator or slip ring made of an alloy material of 5 to 15% by weight.

By the way, in the case of sliding contact devices, the brushes tend to wear out when sliding with the commutator or slip ring, causing noise generation.

On the other hand, commutators or slip rings have high stickiness and poor wear resistance when sliding with brushes.

(Object of the Invention) The present invention has been made to eliminate such drawbacks, and aims to provide a sliding contact device that suppresses brush wear and improves the wear resistance of a commutator or slip ring. It is.

(Structure of the invention) The sliding contact device of the present invention has a Pd of 20 to 70% by weight.

A brush made of an alloy material containing 30 to 80% Ag by weight, 0.5 to 15% CD by weight in Ag, W, and V.

It is combined with a commutator or a slip ring made of an alloy material containing 0.1 to 2% by weight of at least one type of Mo.

In addition, some of the elements added to the alloy material constituting the commitake or slip ring are 0.01 to 0.5 M%.
It is also possible to substitute Fe group elements (Fe, Co, Ni) within the following range.

In the sliding contact device of the present invention, the brush has the same Pd2o~70M amount% and Ag 30~80 as the conventional brushite.
The reason why the alloy material is used is to take advantage of its excellent corrosion resistance.

Commutator or slin ring in Ag from 0.5~
W, V besides adding 15 wt% Cd.

The reason why the alloy material is made of an alloy material containing 0.1 to 2% by weight of at least one type of Mo is to increase the softening temperature during sliding with the brush and improve wear resistance. weight%
If it is less than 2% by weight, the effect cannot be achieved, and if it exceeds 2% by weight, the amount of oxides generated increases.
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Therefore, some of the elements added to the alloy material constituting the commutator or slip ring include Fe group elements (Fe, Co, etc.) in a range of 0.01 to 0.5% by weight.

When substituted with Ni), the crystal grains can be made finer and the wear resistance can be further improved. (If it is less than >1% by weight, no effect of grain refinement will be obtained, and if it exceeds 0.5% by weight, no further effect will be obtained.

(Example and Conventional Example) Brush wire rods made of an alloy material of 60% by weight of Pd and 40% by weight of Ag and having a wire diameter of 0.7 m are each cut into lengths of 8 lengths, and two wires are placed in parallel, with one end having a width of 10 mm. Fins, length 13 fins, thickness
A brush was made by welding it to a 0.2 dragon base material and bending a 2R arc-shaped contact part on the other end. On the other hand, a slip ring with a diameter of 51)n was made by punching out a plate material having a thickness of Q and 5 mm and made of alloy materials having the compositions shown in the left column of the table below. Therefore, a sliding contact device was made by combining these brushes and slip rings, and a sliding test was conducted under the following test conditions by bringing each brush into contact with the slip ring and rotating the slip ring in forward and reverse directions. When we measured the wear amount and contact resistance of the slip ring, we obtained the results shown in the right column of the table below. Test condition type Current: 0.6A Voltage: 12V Load: Resistance load Rotation speed: 1000rpm Circumferential speed: 120-130m/min Contact crab 10
0g Sliding time Near time (blank below) As is clear from the table above, the brushes and slip rings of the sliding contact devices of Examples 1 to 4 are the same as the brushes and slip rings of the sliding contact devices of Conventional Examples 1 and 2, respectively. It can be seen that the amount of wear is less than that of a ring, and the contact resistance is low and stable. This is the alloy material constituting the slip ring of the sliding contact devices of Examples 1 to 4, or at least one of W, V, and Mo.
The addition of seeds increases the softening temperature during sliding, suppresses adhesion during sliding, improves wear resistance, and balances the amount of oxide generated during sliding with the amount of wear. None other than that. In particular, the reason why the slip ring of the sliding contact device of Example 4 has even less wear than the slip rings of other sliding contact devices is that Fe group elements are added to the material constituting the slip ring, and the crystal This is because the particles are finely dispersed, which improves wear resistance.

(Effects of the Invention) As detailed above, the sliding contact device of the present invention
Compared to conventional sliding contact devices, there is less wear on brushes, commutators, or slip rings, there is almost no noise, and the contact resistance is low and stable, so it can replace conventional sliding contact devices. It can be said that it is a groundbreaking thing that can be done.

Claims (1)

[Claims] 1) A brush made of an alloy material containing 20 to 70% by weight of Pd and 30 to 80% by weight of Ag, and 0.5 to 0.5 to 100% of Cd in Ag.
15% by weight and 0.1% of at least one of W, V, and Mo
A sliding contact device combined with a commutator or slip ring made of an alloy material containing ~2% by weight. 2) A part of the elements added to the alloy material constituting the commutator or slip ring is replaced with Fe group elements in a range of 0.01 to 0.5% by weight. The sliding contact device according to item 1.